Score of Baude Cordier's chanson "Belle, bonne, sage," from The Chantilly Manuscript, Musée Condé 564. The manuscript is one of the classic examples of ars subtilior, which requires red notes, or "coloration" to indicate changes in note lengths from their normally written values. This chanson, a dedicatory piece on the love of a lady and a lord written in the shape of a heart, opens the corpus. Note the heart of notes within the larger heart. [Baude Cordier / Chantilly Manuscript -- Public domain -- http://commons.wikimedia.org/wiki/File:Cordier.jpg]